alist = [10, 20, 30, 'bob', 'alice', [1, 2, 3]]
print(len(alist))
print(alist[-1])
print(alist[-1][-1])
print([1,2,3][-1])
print(alist[-2][2])
print(alist[3:5])
print(10 in alist)
print('o' in alist)
print(100 not in alist)
alist[-1]=100
print(alist[-1])
alist.append(200)
print(alist)
